Cooling device for air-cooled engines



' APPLICATION FILED OCT. I8, I920.

Patented Aug. 1, 1922;;

3 SHEETS-SHEET I.

J. BOWEN.

COOLING DEVICE FOR AIR COOLED ENGINES. APPLICATION FILED 00?.18, 1920.

1 4:24:,284, Patented Aug. L 1922:.

3 SHEETS-SHEET 2- J. BOWEN. COOLING DEVICE FOR AIR COOLED ENGINES. APPLICATION FILED OCT. 18, 1920.

1 AZ LQSQ Patented Aug. 11, 1922.

3 SHEETS-SHEET 3.

JAMES BOWEN, 0F SWANSEA, WALES.

Mamas.

Specification of Letters Patent.

Patented Aug. 1, 1922.

Application filed October 18, 1920. Serial No. 417,320.

T 0 all whom it'may concern Be it known that 1, JAMES BOWEN, a subject of the King of Great Britain and Ireland, and a resident of Swansea, county of Glamorgan, South Wales, have invented a certain new and useful Improvement 111 Cooling Devices for Air-Cooled Engines, of which the following is a specification.

This invention relates to cooling devices for cooled engines, and in accordance therewith a device is provided comprising an air chamber fitted upon the top of the cylinder around the top fin, suitably perforated to permit of the passage of air from the atmosphere thereinto, and from which chamber the air is drawn through an outlet connected by piping to an ejector fitted at the end of the exhaust pipe, the exhaust gases passing through the nozzle of the ejector at a high velocity, serving to draw the air from the cooling chamber and eject same to the atmosphere; a fresh supply of air rushes into said chamber through the perforations, and a continuous flow of cool air thus passes over and around the cyln1- der head.

And in order that said invention may be fully understood, it will now be described with reference to the accompanying drawings, and figures and letters of reference marked thereon.

Figure 1 is a diagrammatic view in elevation, showing the device applied to an internal combustion engine.

Figure 2, to an enlarged scale, is a plan of the air-cooling chamber constructed in accordance with .this invention.

Figure 3 is a side elevation of same.

Figure 4 is a side elevation of an ejector adapted to be connected to the exhaust and to a pipe communicating with the cooling chamber; and,

Figure 5 shows, in sectional side elevation, another form of ejector applicable to the cooling device of this invention.

Figure 6 is an end section of same.

Figure 7 is a plan of a copper conductor placed on the cylinder head for absorbing heat therefrom and localizing same to facilitate the action of the device.

In carrying the present invention into ef feet, a cooler or air chamber a, consisting of an aluminium hollow body, made in one, two or three parts, (in the drawings see particularly Figures 2 and 3it is shown as in three sections l 2 3 to suit the design of the engine to which it is to be fitted, is attached to the cylinder head over and around the top fin b, Figure 1.

Said: hollow body is perforated as at b and c-Figures 2 and 3, to permit air to enter same and an outletcZ is provided to which is attached a tube or pipe 6 which may be flexible or rigid, and which is, at its other end, connected to an ejector 7 fixed over the end of the engine exhaust pipe 9 which ejector is formed with a socket or union h for its reception. The ejector comprises (in one form) a hollow chamber formed with a nozzle f, into which a jet 2', into which the end of the exhaust pipe 9 opens, projects and through which the exhaust gases from the engine are ejected at a high velocity, drawing with them air from the cooler at through the pipe 6, and the space around said jet in the hollow chamber I of the ejector aforesaid. A fresh supply of air rushes in through the perforations b and c in the body of cooler a at every exhaust stroke of the engine, hence a constant How of cool air is maintained over the cylinder end.

An advantageous form of ejector f is shown separately in Figures 5 and 6, wherein said ejector takes the shape of a flattened casing having its sides tapering from near the inlet end A. to the outlet B-see particularly Figure 6-in such manner that the nozzle outlet is in the form of an elongated slot 7. The jet portion z' through which the exhaust gases pass from the engine is similarly tapered at its sides j-Figure 5- and has its ends y"-Figure 6opening out fanwise from the exhaust inlet to the outlet, which latter is also in the form of an elongated slot.

At its inlet end, the ejector f is formed or fitted with sockets or unions 7t and k for connection with the pipe or tubing 6 leading from the cooling body a, and with the exhaust pipe 9 of engine respectively. Said sockets or unions may be formed integral with the ejector end, or be aflixed thereto; or said ejector inlet end may be formed open and have a detachable cover fitted thereto which may have the sockets or unions aforesaid integral therewith or afiixed thereto.

In Figure 7 is illustrated a baffle plate of copper placed over the cylinder head and used in combination with the air chamber as.

a ready absorber of the heat from the cylin der head, which is thereby concentrated for action thereupon by the flow of coo-l air through the device. Z and m are respectively ribs and projections formed on and in said plate which act as guides for the air.

I claim 1. A cooling device for air cooled engines, comprising a perforated air chamber adapted to be fitted over the cylinder end around the top fin, means consisting of an ejectorfitted on the end of theexhaust pipe ofthe'engine, and connected to said air chamber by suitable piping, all in, such man ner that air. is drawn from the air chamber at each exhaust stroke of the engine and is replacedby fresh air entering through the perforations in said air chamber, and a constant current of cool-air is caused to flow over thewcylinder end while the engine is working. V

fitted on the endof the engine exhaust pipe and communicating with the end of the tube opposite its connection'with the air chamber for the purpose of drawingair through the tube from-said chamber.

.In ,testimony whereof I have afiixedmy signature hereto this 28rd day of September 1920.

JAMES. BOWEN} 

